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Interactive Mathematics Miscellany and Puzzles
Games, puzzles, proofs, facts, and other resources. http://www.cut-the-knot.org
Math Forum @ Drexel
A center for teachers, students, researchers, parents, educators, and citizens at all levels who have an interest in mathematics education.
Glossary of Mathematical Mistakes
Mistakes made over and over by advertisers, the media, reporters, politicians, activists, and in general many non-math people.
Mathpuzzle.com
Celebrates math puzzles and mathematical recreations.
